Fuel System - Engine Dies After Refueling
SI M 13 03 06
Fuel Systems
May 2006
Technical Service
SUBJECT
Fuel Pump Failure after Refueling with Ethanol Fuel Blend
MODEL
R50, R52, R53 with W10 and W11
SITUATION
Engine dies shortly after refueling, and cannot be restarted again.
CAUSE
Fuel contamination related to a recent introduction of ethanol fuel blends. Ethanol is used as an octane booster, and replaces MTBE (methyl
tertiary-butyl ether) in many fuel formulations.
High levels of water and other residue contaminants may cause damage to a fuel delivery system.
The introduction of ethanol to existing storage tank and distribution systems has acted to absorb the build-up of water and free residual contaminants
accumulating over a period of time at these locations and permits them to be pumped into vehicles at the time of refueling.
Aside from the engine not running, early tests on vehicles with severe contamination reveal, for example, clogged fuel filters and oxidation as the
cause for fuel pump seizure.
CORRECTION
In case of a fuel delivery system failure after refueling, follow the procedure below:
1. Drain all contaminated fuel from the fuel tank and fuel lines.
2. Clean all deposits/residue from the bottom of the fuel tank.
3. Replace the fuel filter/regulator assembly.
4. Replace the fuel pump if seized.
NOTE:
For more information related to ethanol fuel blends refer to SI M13 01 06 (Alcohol Fuel Blends in MINI Vehicles).
WARRANTY INFORMATION
MINI does not cover damage caused by contaminated fuel. Customers should be directed to the facility where the fuel was purchased.
2002-2006 Mini Cooper (R50) L4-1.6L (W10) Page 197
